youtubeFisher v3.0 Beta for Windows 2000/XP/Vista/7 has been released with minor changes and support for additional video formats including the
Full-HD
Super HD 3072p format. That’s right. The standalone open source YouTube downloader now allows you to download YouTube videos at the eye-watering 4096×3072 resolution.

You may view the supported formats in the screenshot given above. The application can be downloaded from the developers website. The link at the bottom will take you to the download page. Make sure you have the required video codecs before attempting to play downloaded YouTube videos.